CVE-2019-9813

high-risk
Published 2019-04-26

Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.

Do I need to act?

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46.7% chance of exploitation in next 30 days
EPSS score — higher than 53% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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1 public exploit available
46646
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Mozilla

References (12)

https://access.redhat.com/errata/RHSA-2019:0966
https://access.redhat.com/errata/RHSA-2019:1144
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-09/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-10/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-12/
https://access.redhat.com/errata/RHSA-2019:0966
https://access.redhat.com/errata/RHSA-2019:1144
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-09/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-10/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-12/
61
/ 100
high-risk
Severity 30/34 · Critical
Exploitability 24/34 · High
Exposure 7/34 · Low